Dynamo-electric machine.



UNITED STATES PATENT orrros.

BERNARD A. BEHREND, OF NORWOOD, OHIO, AISSIGNOR T0 ALLIS-CHALMERS COMPANY, A

OORPORATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANUFACTURING GOM- min, A GORPORATION 0F 01-110.

Dynamo-animals MACHINE.

Specification of Letters Patent.

Patented May 18, 1909.

Application filed larch 14, 1907. Serial No. 882,262.

To all whom it may concern:

Be it known that I, BERNARD A. BEHREND, a citizen of the United States, residing at Norwood, in the county of Hamilton and State of Ohio, have invented'certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a full, clear, and exact description.

invention relates to dynamo-electric.

shaft through thc shaft openings in the housing and connected to the collector rings. The leads are usually connected to the rings by being fastened to the ends of axial studs or bolts extending outward from the rings. In machines of exceedingly high speeds it is necessary to reduce the outer diameter of the collector rings as much as possible in order that their peripheral speed may not be e cessive. In such machines the usu a1 means for connecting the leads to the rin s is impracticable for the reason that the oles for the axial studs would weaken the rin s and shorten the life of the latter by re ucing their wearing depth. Furthermore at the enormous speeds at which these rotar membets are driventhe axial studs would e bent outward by centrifugal force and the-connections between the leads and studs would be broken.

One of the objects of my invention is to provide improved supporting means for the collector leads between the rotary field member'and the collector rings.

A further object is to provide improved means for connecting the collector leads to the collector rings which will be suitable and reliable for any speed of rotation.

, tails of construction and combinations and arrangements of parts described in the specification and set forth in the appended claims.

For .a better understanding of my invention, reference is had to the accompanying drawings, in which-- Figure 1 is an elevation of an inclosed machine of the type for which my invention is intended; Fig; 2 is an enlarged partial sectional View; Fig. 3 is a sectional View along the line 33 of Fig. 2; and Fig. 4 is an enlarged sectional view showing more clearl the means for connecting the collector lea s and rings Referring now to the figures of the draw ings, 10 represents a housing inclosing the stator and rotor of a high speed machine, composed of a central or middle member 11, and two end members 12. The end-members are provided with air admission chambers 13 open at the bottom, which may be connected to a source of air suppl and the main central portion is provide at the top with an opening or chimney 14 through which the air may escape after passing through the will be-caused to pass, preferably by fan blades on the rotor, intuthe admission chambers and then through the stator core and out through the opening or chimney 14.v

Mounted on, the shaft within the housing is the rotar member or rotor 15 of a dynamo-electric machine in this case the rotary field magnet of a high speed turbo alter- 'nator. Also mounted on the shaft, in this case at each end of the machine and on the outside of the housing, is a. collector ring or slip ring 16. ll desired, however, both rings may be at the same end of the machine. As is shown the rin s are mounted on inclined portions 17 o the shaft, being separated therefrom by suitable insulation 17. The diameter of the shaft outside of the housingand the thickness of the collector rings are made as small as possible so that the peripheral speed of the collector rings and the peripheral speed of the shalt within the bearings (not shown) are as small as possible. tightly on the shal't and retained in position by a nut 18 which engages a threaded portion 19 of the shalt. other insulating material, is interposed be twcen the nut and ring. As is shown, the

collector ring is provided on the side remote from the rotor with a recessed portion 21 in which the insulating ring is located. The

nut is also either partially or wholly located The insnhitwithin the recessed portion. ing ring is thus protected against injury or displacement and the machine is considerably shortened.

At 2'2. is shown a collector lead or coni ductor which connects one end ol the held i magnet winding (not shown) with one of the collector rings. The lead which preferably consists of one or more layers of strap copper extends from the lield magnet between a nut 23 and a ring 24, into a longitudinal slot or groove 25 in the shaft, which slot or groovc extends from a point within the housing adjacent the lield magnet to a point outside of the housing a short distance from the collector ring. Surrounding the grooved or slotted portion of the shalt and fitting tightly thereon is a cylindrical sleeve or collar 26 which retains the lead in position 1 and prevents its accidental displacement by centrifugal action. The lead is oi course carefull insulated from the retaining and protecting members. As is shown the wall of the end portion 12.01 the housing lits closely around the sleeve, which thus not only retains the lead in position in the slot or groove but acts as a stalling sleeve to prevent the moist or oil laden air from the im-.

mediate vicinity of the machine from being drawn into the shalt ope-nin The clear anee between the sleeve and the wall of the housii V is just snllicicnt to prevent engagement etwcen said parts. A sleeve 26 is em loyed at each end of the machine.

is was stated before, the methods usually employed for connecting the collector leads to the collector rings are unsuitable for one chines, the ap tary members cl which are driven at exfi'edingly high speeds,,sneh as the speed at which the held magnets ol two pole, sixty cycle turho-alternators are driven.

is shown in Figs. 2 and 4 the lead is clamped between the shaft and the ring, being located in a groove or slot 27 in one of said inenibei's,intliis case the ring, the groove extending across the portion ol the ring which bears on the shaft. This poi-lion ol"the lead is of course uninsulated so that a good trio connection is secured. The end 2b of the lead as is shown is bent outward into i Each of the slip rings is clamped A ring 20 of liber, or-

elec- I by the nut 18 and insulating rin r 20. Thus it is seen that the lead is held. ti itly against the ring on two sides thereof and good electrical connection is secured by the pressure between the ring and shaft and the ring and nut. 'lhis clamping action alone may be relied on for securing the lead to the ring. in this case, however, 1 have shown the end of the lead fastened positively to the ring by one or more screws 30, the heads of the screws being countersunk in a block or stri metal preferably brass or copper. '1 1e fiber ring 1!) is notched to receive the block 31 and end of the lead. it is to be understood that both collector leads are supported, and l connected to the collector rings in the manner shown.

it will be seen that the collector leads are so well supported between the field magnets and the rings that there is no danger of their being broken or displaced by centrifugal action. Also the leads are connected to the rings without weakening the latter or limiting their wearing de ith, and are so securely connected thereto t hat excellent electrical and mechanical connections are obtained.

1 do not wish to be confined to the exact details shown but aim in my claims to cover all modifications which do not involve a departure from the spirit and scope of my invention.

hat 1 claim as new is: 1. in a dynamo-electric machine having an inclosing housing provided with shalt openings, a rotor provided with a shaft extending through said shaft openings, said shalt having a longitudinal groove or slot, a collector lead located in the groove or slot, and means for retaining said lead in position, said means surrounding the shaft and rotatable therewith and insulated from the lead, the walls of the housing :litting closely around said retaining means.

2. in a dynamo-electric machine, a rotor 3 providedwith a shaft, a stator provided with an inclosmg housing having a shaft 0 ening through which said shaft projects sai shalt having a longitudinal groove, a collector lead located in said groove, and a sleeve rotatable with the shaft surrounding said grooved portion of the shaft and located in the opening in the housing, and means for insulating the lead from said shaft and sleeve.

3. A dynamo-electric machine, comprising l a stator having an int-losing housing provided with a shaft opening, a rotor provided with a shaft extending outwardly through said o pcning, said shafthaving a. longitudinal slot adjacent the opening in said housing, a colronnding the shaft and lead at the shaft opening in the housiiu and rotatable with said shalt, said sleeve Jl'lllg insulated from said lead and serving to retain the lead in l position in said groove or slot, a collector lector lead provided in the slot, a sleeve surring on the shaft outside of said housing, and means for fastening the extreme and of said collector lead to said ring.

4. In a dynamo-electric machine, a rotor shaft carrying a core and Winding, a collector ring mounted on the shaft, a collector lead connecting the winding and. the collector ring, said lead extending through the ring,

between the shaft and ring, and having, its

extreme and bent outward, and means for forcing the end of the lead into contact with the side of the ring.

5. In .a dynamo-electric machine, a rotor shaft carrying a core and winding, a collector ring mountcd'on the shaft, and a collector lead connecting the winding and the ring, said lead passing through the ring, between the shaft and ring in a groove or slot in one of said members, and having its extreme end bent outward and fastened in contact with the side of the ring remote from the core and windin 6. In a dynamo-electric machine, a rotor shaft having a core and winding, a collector: ring on the shaft, said ring having a recess on the side remote from the core and winding, a collector lead extending under the ring and having its end bent outward into said recess, and means for clamping the end of the lead in. contact with the ring.

7. In a dynamo-elect1ic machine, a rotor shaft, having a core and winding, a collector ring having on the side remote from the rotor core an annular recess, and a collector lead extending from the rotor winding to the ring passing between the shaft and the ring, and having its end bent outward in said recess, and means for clamping the lead to the side of the ring.

8. In a dynamo-electric machine, a shaft, a

collector ring, a collector lead, and. unitary means for clamping the ring to the shaft and the lead to the ring.

9. In a dynamo-electric machine, a shaft, a collector ring, a collector lead, and a nut for clamping the ring to the shaft and the lead in contact with the ring.

10. In a dynamo-electric machine, a shaft having an inclined portion, a collector ring seated on said inclined portion a collector lead extending along the shaft to the ring, and a nut surrounding the shaft for holding the ring in position and. for clamping the lead in contact with the ring.

11. In a dynamo-electric machine, a shaft, a collector ring mounted on the shaft, a collcctor lead made of a continuous strip of conducting material extending through the ring between the shaft and ring in contact with the inner smface of said ring, said lead having its extreme end bent outward in contact with the side of the ring, and means for fastening the end of the lead to the ring.

12. In a dynamo-electric machine, a rotor shaft carryin r a core and Winding, a collector ring, and aco ector lead made of acontinuous strip of conducting material connecting the winding and ring, said lead extending through an openingin the ring in electrical contact with said ring to the side of the latter remote from the core and winding, and means for fastening its extreme end to the remote side of the ring.

In testimony whereof I afiix my signature, in the presence of two Witnesses.

BERNAR D A. BEHREND,

Witnesses:

ARTHUR F. KWIS, FRED J. KINSEY. 

